LikeC4

LikeC4 for Zed

LikeC4 language support for the Zed editor.

LikeC4 is an architecture-as-code DSL that lets you describe your software architecture with a simple, human-readable language and visualize it as interactive diagrams.

This extension brings first-class LikeC4 editing experience to Zed with a custom tree-sitter grammar and the official LikeC4 Language Server.

Features

Syntax highlighting — rich, tree-sitter-based highlighting for all LikeC4 constructs
Code completion — context-aware suggestions for elements, relationships, views, and keywords
Diagnostics — real-time validation errors and warnings as you type
Hover information — documentation and details on hover
Go to Definition — jump to element and relationship definitions
Find References — locate all usages of an element across your workspace
Rename — safely rename elements with all references updated
Code outline — navigate your architecture models with the Outline panel
Auto-indentation — smart indentation for all block types
Bracket matching — automatic matching of braces

Installation

Open Zed
Open the Extensions panel (Cmd+Shift+X on macOS)
Search for "LikeC4"
Click Install

The extension will automatically download and manage the LikeC4 language server.

Configuration

Language Server Settings

You can pass custom settings to the LikeC4 language server through your Zed settings (Cmd+,):

{
  "lsp": {
    "likec4-language-server": {
      "settings": {},
      "initialization_options": {}
    }
  }
}

Limitations

No diagram preview — Zed does not currently support webview panels in extensions, so live diagram visualization is not available. Use the LikeC4 CLI or the VSCode extension for diagram previews.

Development

Prerequisites

Rust (installed via rustup)
The wasm32-wasip1 target:
```
rustup target add wasm32-wasip1
```

Building

# Lint (mirrors CI)
cargo clippy --target wasm32-wasip1 -- -D warnings

# Build release WASM
cargo build --release --target wasm32-wasip1

Testing locally

Open Zed
Open the Extensions panel
Click Install Dev Extension
Select the root directory of this repository
Open a .likec4 file to verify syntax highlighting and the language server

Resources

License

MIT — see LICENSE for details.